Electric heater



Jan. 1, 1929. 1,696,989

E. UNGER ELECTRIC HEATER Filed July 21, 1927 !NVENTOR firm M 901;

ATTORNEY Patented Jan. 1 i929.

UNETED STA'E'ES ERNEST U'NGER, 0F BROOKLYN, NEW YORK.

ELECTRIC HEATER.

Application filed July 21,

The invention relates to an electric heater constituting part of the apparatus used in practicing the art of waving hair on a persons head in the so-called permanent hair waving treatment. The primary obJect of the invention is to provide a simplified form of electric heater of the hollow tube type now in general use and which can be manufactured and marketed at a cost less than the present market price of similar forms of heaters.

Accordingly, the invention features simplicity in construction of such a heater, the forming of the parts as far as possible from drawn tubing and stamping, the minimizing in the number and formation of component parts and the providing of means for securing the parts without necessity of providing fastening means other than the structural parts necessary to form the heater.

Another object is to provide a heater of the type outlined which can be conveniently manipulated and in which the usual support ing electric leads may be utilized in connection with an insulating knob of small dimension to adjust the heater as a wnole while in use.

Still another object of the invention is to provide as part of the heater an improved form of readily removable closing cap which will provide for the requisite amount of steam leakage from the heater, which will assist in locating a contained curling stick or rod,

which will act to center the rod in the tube and when removed from the tube will provide free access to the tube and cap to permit cleaning of the same.

Various other objects and advantages of the invention will be in part obvious from an inspection' of the accompanying drawings and in part will be more fully set forth in the following particular description of one form of mechanism embodying my invention, and the invention also consists in certain new and novelfeatures of construction and combination of parts hereinafter set forth and claimed. 1

In the accompanying drawing,

Fig. 1 is a view partially in side elevation of an electric heater constituting a preferred embodiment of the invention and partially in axial section.

Fig. 2 is a transverse sectional view taken on the plane indicated by the line 22 of 1927. Serial No. 207,558.

Fig. 1 and looking in the direction indicated by the arrows; and

Fig. 3 is a transverse sectional view of the cap and taken on the line 3 3 of Fig. 1.

In the drawings, there is shown a relatively long inner tube it) opened at opposite ends and having a straight, uniform bore 11 for containing the strands of hair wrapped on a curling rod (not shown) as is usual and well known in similar structures. Encircling the portion of the tube 10 adjacent one end 12 is a relatively short frustoconical outer shell 13 providing, between the shell and the inner tube, a heating space 14 containing the usual electric windingsl5. The end 12 of the inner tube is spun over the smaller end 16 of the outer shell so as to provide a waterproof lap joint therebetween. The opposite, larger end 17 of the outer shell is closed by means of an end plate 18 which encircles the inner tube 10 and is provided with a flange or shoulder 19 telescoping into the outer shell. Exteriorly of the end plate, the inner tube is formed with a bead 20 which laps the end plate and prevents movement of the end plate away from the outer shell. The outer shell and the flange 19 are provided with interlocking depressions or notches 21 which act to prevent relative rotary movement betweenthe end plate and the outer shell.

The opposite or rear end of theinnertube 1,1 is exteriorly screw threaded as shown at 22 and is engaged bya screw cap 23. The cap is formed of two parts, a tubular metal part 24 and a disc like fiat bakelite knob 25. The metal tubular part- 24: includes in order from left to right of the showing in Fig. 1, a cylindrical sleeve 26 internally threaded and adapted to engage the threads 22 on the inner tube. Next in order, the cap is formed with a reinforcing bead 2? which merges into the larger end of a frusto-conical rod guiding portion 28 and this in turn has its smaller end distended to form a small tubular portion 29, the outer end of which is upset to form an outwardly extending annular fastening flange 30 for securing the knob 25 in place. In order to prevent rotary movement of the knob on the tube 29, the rear portion of the knob is provided wit-h a boss 31 and the portion of the tube extending through its here is formed non-circular in outline, in the instant case shown to be hexagonal as indicated at 32, Fig. 3. The portion of the tube 29 beyond the hexagonal portion is circular in outline ,to (provide a centeringaneans .i'or engagingithe usual curling stick'ito center the same axially in the tube 10.

The knob 25 is of moulded bakelite or similar heat insulating 'materiahis of greater diameter than the cylindrical portioniflfiof.

the cap and has its outer edge milled as 'indicated at 3st whereby the-' knob canbe conveniently gripped without the operators lingers coming in cont act with r the hot metal portion of the cap.

A: stral) encircles-the inner tube adj aceut its threaded end and between, this threaded end and llllOfOllllQl' shell. The strap is adjustablyfastened in positiongon =the shell'byineansof asmal-lsscrew' and nut form of @clainp 36. The upper freeends of the strap-35 are bent about a groove37 formed about, the outer sides of :a cylindrical, spoollike sleeve 38: formed {of insulating material. The strap is .heldugainst 'rotanyanovement on .the shell by ,meansota-notch 39in .the inner ttlbGwPlOjQCtlDQ; between the ends of the strap 35 as particularly shown in Fig. 2. The sleeve-is :pro-Viid-ed Withaan axially extending bo-re lO t'hro-ugh which ispassed electric ileadsel which extend the-rethrough, along the portion of theitu'be 10between the same and the end. plate, through lead apertures 42-inthe end platewvhichlare in substantial"alignment: withqthe bore 40. The ends of the leads; intruded through theiend plate 18 :are connected electrically ,to the winding 15 within the outershelL it is readily appreciated that the-several parts of {theistructure as thus, described can be cheaply constructed in large quantities as a ataetory production. The severalparts can be readily drawn and stamped-to shapeand erzceptqfcr the threading of the {flat end tube refinedunaohine operation is reduced to a minimum. Positioning the insulating .sleeve and v the electric leads extending therethrough :uljacent the heatuinsulating knob permits tric leads and the windings in the outer shell.

'lhe cap normally remains in position in threaded engagement with the inner tube but may betreadily unscrewed so as to permit :access to the interior .ofboth the tube and cap forthe purpose of cleaning the same. '1 he construction disclosed :features the ehermetic-sealing of the heater winding so that the windings areprotected while in use and while the structure is; rbeingcleaned.

I claim 1. A.cap.includingaone piece metal tube fashion-ed to form in order trom one end, a cylindrical portion, a bead a frusto-conical portionland -a;tube non-circular in cross section, anapertured knobuwith the non circular tube extending-through its aperture and said tube acting to'hold the knob from relative rotary movement ,antlather outer end, 10f said tubetbeing spun over to secure the knob in --place.

2. AnI electric heater comprisinga ,long

metal tube opened at bothends andw'ithone end exterior-1y threaded, a screw cap inengageinen-twith the threaded end .anchprovided axially oft-he bore of the, tube Withan aperture, said capcprovided with a knob tor-med of insulating material. forahandling the heater as a whole. I

SignedratNew York, in the county of New York; and State of New York, this seventh da-y ozt July, A, D. 1927.

ERNEST UN GER. 

